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Position estimation device, position estimation system, position estimation method, and computer-readable recording medium

a technology of position estimation and position estimation, which is applied in the direction of rapid change measurement, structural/machine measurement, instruments, etc., can solve the problems of high cost of deploying many pressure meters in the pipeline network, excessive pressure wave, and inability to accurately estimate a position

Inactive Publication Date: 2017-11-16
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The devices in this patent can accurately identify where a pressure wave is generated. This helps in accurately estimating the position.

Problems solved by technology

A cause of generation of an excessive pressure wave may be a sudden operation of a pump, a valve or the like, a sudden change in the use amount of water, a fault or rupture of a pipe constituting a pipeline network, and the like, for instance.
Therefore, an excessive pressure wave may deteriorate a pipeline network, or may be a factor of a fault or rupture of a pipe constituting a pipeline network.
However, deploying many pressure meters in a pipeline network generally costs high.

Method used

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  • Position estimation device, position estimation system, position estimation method, and computer-readable recording medium
  • Position estimation device, position estimation system, position estimation method, and computer-readable recording medium
  • Position estimation device, position estimation system, position estimation method, and computer-readable recording medium

Examples

Experimental program
Comparison scheme
Effect test

first example embodiment

[0063]Next, the first example embodiment of the present invention will be described. FIG. 3 is a diagram illustrating a position estimation device in the first example embodiment of the present invention. FIG. 4 is a diagram illustrating a position estimation system in the first example embodiment of the present invention, and a pipeline network in which an occurrence position of a pressure wave is estimated with use of the position estimation system. FIG. 5 is a diagram illustrating local peaks of a cross-correlation for use in estimating an occurrence position of a pressure wave by the position estimation device in the first example embodiment of the present invention. FIG. 6 is a flowchart illustrating an operation of the position estimation device in the first example embodiment of the present invention.

[0064]As illustrated in FIG. 3, a position estimation device 100 in the first example embodiment of the present invention includes a first cross-correlation derivation unit 110, ...

second example embodiment

[0095]Next, the second example embodiment of the present invention will be described. FIG. 7 is a diagram illustrating a position estimation device in the second example embodiment of the present invention. FIG. 8 is a diagram illustrating an example of a case where a predicted position setting unit of the position estimation device in the second example embodiment of the present invention sets a predicted occurrence position of a pressure wave. FIG. 9 is a diagram illustrating an example of a case where a predicted occurrence position of a pressure wave in a pipeline network is searched by the position estimation device in the second example embodiment of the present invention. FIG. 10 is a diagram illustrating an example of an operation of the predicted position setting unit of the position estimation device in the second example embodiment of the present invention.

[0096]As illustrated in FIG. 7, a position estimation device 200 in the second example embodiment of the present inve...

third example embodiment

[0134]Next, the third example embodiment of the present invention will be described. FIG. 11 is a diagram illustrating a configuration of a position estimation device 300 in the third example embodiment of the present invention. FIG. 12 illustrates an example of a case where there is a difference in the propagation velocity of a pressure wave in a pipeline network. FIG. 13 illustrates another example of a case where there is a difference in the propagation velocity of a pressure wave in a pipeline network. FIG. 14 illustrates an example of a cross-correlation relating to a combined wave of pressure waves whose propagation velocities are different. FIG. 15 is a schematic diagram illustrating an example of an operation of a first cross-correlation derivation unit 110 and a correlation separation unit 350 in the third example embodiment of the present invention.

[0135]As illustrated in FIG. 11, the position estimation device 300 in the third example embodiment of the present invention i...

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Abstract

Provided is a position estimation device and the like which accurately estimate an occurrence position of a pressure wave. The position estimation device is provided with: a first cross-correlation derivation means for deriving a first cross-correlation relating to a pressure of fluid based on measurement values obtained by measuring a pressure of fluid flowing through a pipeline network at least at two positions in the pipeline network, a second cross-correlation derivation means for deriving a second cross-correlation relating to a pressure of fluid based on calculation values obtained by calculating a pressure of fluid at least at the two positions in the pipeline network, and an estimation means for estimating an occurrence position of a pressure wave based on a difference between the first cross-correlation and the second cross-correlation.

Description

TECHNICAL FIELD[0001]The present invention relates to a position estimation device, a position estimation system, a position estimation method, and a computer-readable recording medium.BACKGROUND ART[0002]In a pipeline network through which fluid such as liquid or gas flows, due to a change in the flow rate of fluid flowing through the pipeline network, a large pressure wave (hereinafter referred to as an “excessive pressure wave”) as compared with a case where fluid constantly flows may be generated. A cause of generation of an excessive pressure wave may be a sudden operation of a pump, a valve or the like, a sudden change in the use amount of water, a fault or rupture of a pipe constituting a pipeline network, and the like, for instance.[0003]An excessive pressure wave exerts a load in a pipeline network. Therefore, an excessive pressure wave may deteriorate a pipeline network, or may be a factor of a fault or rupture of a pipe constituting a pipeline network. In view of the abov...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01L23/00
CPCG01L23/00F17D5/02F17D1/20G01M3/243F17D5/06
Inventor KUMURA, TAKAHIROTAKATA, SOICHIROSASAKI, YASUHIRO
Owner NEC CORP